Palisades Park, New Jersey in the context of "U.S. Routes 1 and 9"

This is a list of ethnic enclaves in various countries of different ethnic and cultural backgrounds to the native population. An ethnic enclave in this context denotes an area primarily populated by a population with similar ethnic or racial background. This list also includes concentrations rather than enclaves, and historic examples which may no longer be an ethnic enclave.

U.S. Route 1/9 (US 1/9 or US 1-9) is the 31.0-mile-long (49.9 km) concurrency of US 1 and US 9 from their junction in Woodbridge in Middlesex County, New Jersey, north to New York City. The route is a multilane road with some freeway portions that runs through urbanized areas of North Jersey adjacent to New York City. Throughout most of its length in New Jersey, the road runs near the New Jersey Turnpike (Interstate 95 [I-95]). In Fort Lee, US 1/9 merges onto I-95 and crosses the Hudson River on the George Washington Bridge, where the two U.S. Routes split a short distance into New York. US 1/9 intersects several major roads, including I-278 in Linden, Route 81 in Elizabeth, I-78 and US 22 in Newark, Route 139 in Jersey City, Route 3 and Route 495 in North Bergen, and US 46 in Palisades Park. US 1/9 also serves as the primary access point to Newark Airport. Between Newark and Jersey City, US 1/9 runs along the Pulaski Skyway. Trucks are banned from this section of road and must use Truck US 1/9. The concurrency between US 1 and US 9 is commonly referred to as "1 and 9". Some signage for the concurrency, as well as the truck route, combines the two roads into one shield, separated by a hyphen (1-9) or an ampersand (1&9).

The current alignment of US 1/9 south of Elizabeth was planned as Route 1 in 1916; this road was extended to the Holland Tunnel in Jersey City in 1922. When the U.S. Highway System was created in 1926, US 1 and US 9 were marked concurrent through northern New Jersey between Rahway on the current alignments of Route 27 and Truck US 1/9. In 1927, Route 1 became Route 25, and Route 1 and Route 6 were legislated along the current US 1/9 north of Jersey City. US 1/9 originally went to the Holland Tunnel on Route 25; after the George Washington Bridge opened, the two routes were realigned to their current routing north of Jersey City. After the Pulaski Skyway opened in 1932, US 1/9 and Route 25 were routed to use this road, which soon had a truck ban resulting in the creation of Route 25T (now US 1/9 Truck). South of Newark, US 1/9 was moved from Route 27 to Route 25. In 1953, the state highways running concurrent with US 1/9 in New Jersey were removed. In 1964, the approaches to the George Washington Bridge were upgraded into I-95.

U.S. Route 46 (US 46) is an east–west U.S. Highway completely within the state of New Jersey, and runs for 75.34 mi (121.25 km). The west end is at an interchange with Interstate 80 (I-80) and Route 94 in Columbia, Warren County, on the Delaware River. The east end is in the middle of the George Washington Bridge over the Hudson River in Fort Lee, Bergen County, while the route runs concurrently with I-95 and US 1/9. Throughout much of its length, US 46 is closely paralleled by I-80. US 46 is a major local and suburban route, with some sections built to or near freeway standards and many other sections arterials with jughandles. The route runs through several communities in the northern part of New Jersey, including Hackettstown, Netcong, Dover, Parsippany–Troy Hills, Wayne, Clifton, Ridgefield Park, Palisades Park, and Fort Lee. It crosses over the Upper Passaic River at several points. The road has been ceremonially named the United Spanish–American War Veterans Memorial Highway.

What is now US 46 was originally designated as three separate routes. Pre-1927 Route 5 was created in 1916 to follow the road from Delaware to Denville, pre-1927 Route 12 in 1917 to follow the route between Hackettstown and Paterson, and pre-1927 Route 10 in 1917 to run between Paterson and Edgewater. In 1927, Route 6 was legislated to run from Delaware east to the George Washington Bridge, replacing portions of Routes 5 and 12 and paralleling the former Route 10, which itself became Route 5 and Route 10N, the latter being shortly removed from the state highway system. In 1936, US 46 was designated to run from U.S. Route 611 in Portland, Pennsylvania, east to the George Washington Bridge. The route replaced Pennsylvania Route 987 (PA 987) to the Delaware Bridge over the Delaware River, and from there followed Route 6 across New Jersey. In 1953, the Route 6 designation was removed from US 46 in New Jersey, and later that year, the route was realigned to end at US 611 in Columbia, New Jersey, replacing a part of Route 94. US 611 had been brought into New Jersey by two new bridges over the Delaware River, following a freeway between them that became a part of I-80. In 1965, US 611 was aligned back into its original Pennsylvania route (which from 1953 until 1965 was US 611 Alternate), and US 46's western terminus remained as an interchange ramp with I-80 and Route 94. Its number is out of place since US 46 lies north of US 22, US 30 and US 40. US 46 is the shortest 2-digit US Highway.